Evaluating the Impact of GOLD FUV Emission Data Assimilation on Thermospheric Tides

This study addresses the challenge of accurately capturing the dynamics of Earth’s upper atmosphere by evaluating how data assimilation of space-based far ultraviolet (FUV) dayglow observations influence the representation of tidal modes in a whole atmosphere model. Building off of prior work, GOLD FUV disk measurements of N2 Lyman-Birge-Hopfield (LBH) bands are assimilated into the NOAA’s operational Whole Atmosphere Model (WAM) using the GSI Ensemble Square-Root Filter. We will present experiment results from an early November 2018 minor storm period comparing assimilation and forecasting cycling experiments. These comparisons reveal considerable impacts of covariance localization schemes on tidal structures of the thermosphere.